如何從兩個表1個查詢在Salesforce SOQL iOS的選擇

Question

我怎樣才能在Salesforce SOQL查詢合併這兩請求轉換成1個單個請求在iOS設備上：

NSString *theRequest = [NSString stringWithFormat:@"SELECT Name, OpportunityID FROM OpportunityLineItem where OpportunityID = '%@'", [companyDic objectForKey:@"Id"]]; 
SFRestRequest *request = [[SFRestAPI sharedInstance] requestForQuery:theRequest]; 
[[SFRestAPI sharedInstance] send:request delegate:self]; 

和

NSString *theRequest2 = [NSString stringWithFormat:@"SELECT CompetitorName FROM OpportunityCompetitor where OpportunityID = '%@'", [companyDic objectForKey:@"Id"]]; 
SFRestRequest *request2 = [[SFRestAPI sharedInstance] requestForQuery:theRequest2]; 
[[SFRestAPI sharedInstance] send:request2 delegate:self]; 

Answer 1

使用此子查詢：

SELECT Name, OpportunityID FROM OpportunityLineItem where OpportunityID IN (SELECT OpportunityID FROM OpportunityCompetitor where OpportunityID = '%@')